Plumb bob



v mn/144,4

March 6, 1934.

A' tr MCLAW5 Patented Mar. 6, 1934 UNITED STATES PATENT OFFICE PalmBeach, Fla.

signor of one-fourth to Elmore Cohen,

West

Application December 4, 1930, Serial No. 499,998

Claims.

My invention relates to plumb bobs for use by surveyors, carpenters,mechanics, masons, marble setters and all other crafts.

The primary object of my invention is the pro- 5 vision of a plumb bobwith a nonrigid point, in which the tip of the bob is so operated as tobe withdrawn from the body of the bob by means of the weight of the bodyupon the plumb line when the bob is in actual use, and recoiling intothe io body of the bob by means of a spring when the plumb line is freeof tension, thereby protecting and greatly lengthening the life of thepoint of the bob.

Another object of my invention is the provision of a plumb bobconsisting of a minimum of parts, any of which can be replaced quicklyand at slight cost.

A further object of my invention is the provision of a type of bob thatmay be increased or decreased in weight, or varied in shape, therebymaking its use more universal.

With the foregoing and other objects in view, my invention consists inthe construction, combination and arrangement of parts, as arehereinafter more fully described and illustrated in the attacheddrawing.

One form of the invention is illustrated in the accompanying drawing, inwhich Figure 1 is an elevaition of the tool. Figure 2 is a verticalcross section showing all parts, Plumb line l passes down through cap 2,said cap being secured to a body member 3 by threads 8. The line thenpasses slidably through eyelet 6 which is positioned below the upper endof pin 4, then over the head of pin 4, through a slot 9 in the head ofthe pin 4. The end of the line l is made fast to the eyelet 5 that isfixed to body member 3 below the slot 9 and on the side of pin 4opposite that on which eyelet 6 is positioned.

Pin 4 slidably passes through the body of the bob 3 and forms a pointfor the bob. Spring 7 holds the pin 4 receded until the weight of theentire tool is hanging on plumb line l. When the bob is thus suspendedby the line, its weight being greater than the resistance of the spring,the point is projected from the body of the bob and is exposed. As soonas the weight is taken oi the plumb line 1, spring 7 forces the pin 4upwards and protects the point of the pin 4.

Having thus described my invention, I make the following claims:

1. The combination, in a plumb bob of an apertured hollow body with twoeyelets therein, a removable threaded cap, a pin movable to project fromthe body through the aperture and havln! a slotted head and a springthat flts around said pin.

2. The combination, in a plumb bob, of an apertured hollow body with twoeyelets therein, a removable threaded cap, having a hole there- .0through, a pin movable to project from the body through the aperture andhaving a slotted head, together With spring that fits around said pinand a cord or plumb line attached to one of the eyelets, extending overthe pin through slot in the 3; head thereo-f, thence slidably throughother eyelet and protruding through the hole in the cap.

3. The combination in a plumb bob of an apertured hollow body and ahollow threaded cap having an aperture to permit the passage of a plumbline, a slidable pin having a slotted head mounted in said hollow bodyadapted to project from the body through the aperture, a spring aroundsaid pin adapted to normally retain said pin within the body, eyelets onboth sides of said pin, a plumb line Secured to one of said eyelets andpassing over the slotted head throughthe eyelet on the opposite side andthrough the aperture in the threaded cap, said pin adapted to beprojected through the lower aperture when the body of the bob issuspended from the plumb line.

4. A plumb bob having an apertured hollow body, a removable threaded caphaving an opening therethrough, a slidable pin adapted to project fromthe body, resilient means in cooperation with said pin adapted tonormally hold said pin within said body, a plumb bob cord secured withinsaid body and adapted to pass over the top of said pin, a secondsecuring means within said body on the opposite side of said pin, saidcord adapted to continue under said last mentioned securing means and upthrough said opening in said cap so -that upon suspension said pin willbe forced against resilient means through said aperture.

5. A plumb bob having an apertured hollow body and a cap apertured topermit the passage of a plumb bob cord, a slidable pin mounted in saidbody and adapted to project through the bottom of said body, resilientmeans normally holding said pin retracted, eyelets on both sides of saidpin, said cord Secured to one of said eyelets and extending across thetop of said pin under the second eyelet and out through the apertureformed in the cap, said pin adapted to be projected through said openingin the bottom of said body upon the suspension of said plumb bob on saidcord.

ADAM JoHNs'roN McLAWs.

